The principle of parallel frequency acquisition is analyzed with Compass-2 satellite signal acquisition algorithm of FFT parallel frequency search. The designed acquisition model was simulated with Matlab. The influence of the different pa-rameter settings of FFT spot number,sub-correlator number and tapping winning on acquisition speed,frequency search range and sensitivity performance were obtained by comparison and analysis. The balance of resource consumption and performance were considered in the actual design. The FPGA implementation scheme of the improved acquire system is given in this paper. Structure of the traditional correlator was improved,in which the multiple sub-correlators are simulated with the subsection inte-gral mode of a same correlator to reduce the spending of hardware resource and improve the efficiency of the correlator.%采用FFT并行频率搜索的北斗二代卫星信号捕获算法，分析了并行频率捕获原理，利用Matlab对设计的捕获模型进行仿真，通过对比分析得到不同的FFT点数、子相关器个数及抽头设置等参数设置对捕获速度、频率搜索范围及灵敏度等性能的影响。在实际设计中考虑到资源消耗和性能的平衡，给出改进后的捕获系统的FPGA实现方案。改进传统的相关器结构，采用同一相关器分段积分方式模拟多个子相关器，减少硬件资源开销，提高了相关器使用效率。
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